Blair Spotweld Cutter - $10 (Johnsburg)

Blair Spotweld Cutter p/n 13224 with package of 3 additional cutting ends.
Cuts Spotwelds Out Fast.
Double-end cutter for more holes.
Use in hand-held drills - for 1/4" or larger drill chucks.
Cutter size: 3/8" Package is unopened, unused.
Additional bits may have been part of a larger package; unclear.